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    • 7. 发明专利
    • Semiconductor electrochemical sensors
    • GB2450002A
    • 2008-12-10
    • GB0810556
    • 2008-06-09
    • SENSOR INNOVATIONS INC
    • KAHN CAROLYN RWONG ELICIANORVIEL VERN
    • G01N27/30G01N33/00
    • Described herein are substrates, sensors and systems related to measuring the concentration of an analyte such as hydrogen ion in a sample for determining the samples pH. Redox active moieties whose reduction and/or oxidation potentials are sensitive to the presence of an analyte (such as H ion) are immobilized onto a semiconductor surface. Immobilized redox active moieties whose reduction and/or oxidation potential are insensitive to the analyte can also be used for reference or can be used to detect a second analyte (such as ammonia, oxygen or carbon dioxide). Voltammetric measurements made using such modified semiconductor surfaces can accurately determine the presence and/or concentrations of analytes in a sample of interest. The semiconductor electrochemical sensors of the invention are accurate and robust and can be made so as not to require calibration or re-calibration. Figure 5 shows one embodiment wherein a silicon semiconducting electrode is modified with ferrocene moieties, vinyl-ferrocene (VFc) and ferrocene carboxaldehyde (FcA) by covalent attachment. A method of forming the derivatized semiconductor surface is also disclosed. Further embodiments relate to voltammetric measuring of a pH value in a waste or water treatment process or from a biopharmaceutical process.